// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2009 Gael Guennebaud <gael.guennebaud@inria.fr>
// Copyright (C) 2009 Hauke Heibel <hauke.heibel@googlemail.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

#ifndef EIGEN_STL_DETAILS_H
#define EIGEN_STL_DETAILS_H

#ifndef EIGEN_ALIGNED_ALLOCATOR
#define EIGEN_ALIGNED_ALLOCATOR Eigen::aligned_allocator
#endif

namespace Eigen {

// This one is needed to prevent reimplementing the whole std::vector.
template<class T>
class aligned_allocator_indirection : public EIGEN_ALIGNED_ALLOCATOR<T>
{
  public:
	typedef std::size_t size_type;
	typedef std::ptrdiff_t difference_type;
	typedef T* pointer;
	typedef const T* const_pointer;
	typedef T& reference;
	typedef const T& const_reference;
	typedef T value_type;

	template<class U>
	struct rebind
	{
		typedef aligned_allocator_indirection<U> other;
	};

	aligned_allocator_indirection() {}
	aligned_allocator_indirection(const aligned_allocator_indirection&)
		: EIGEN_ALIGNED_ALLOCATOR<T>()
	{
	}
	aligned_allocator_indirection(const EIGEN_ALIGNED_ALLOCATOR<T>&) {}
	template<class U>
	aligned_allocator_indirection(const aligned_allocator_indirection<U>&)
	{
	}
	template<class U>
	aligned_allocator_indirection(const EIGEN_ALIGNED_ALLOCATOR<U>&)
	{
	}
	~aligned_allocator_indirection() {}
};

#if EIGEN_COMP_MSVC

// sometimes, MSVC detects, at compile time, that the argument x
// in std::vector::resize(size_t s,T x) won't be aligned and generate an error
// even if this function is never called. Whence this little wrapper.
#define EIGEN_WORKAROUND_MSVC_STL_SUPPORT(T)                                                                           \
	typename Eigen::internal::conditional<Eigen::internal::is_arithmetic<T>::value,                                    \
										  T,                                                                           \
										  Eigen::internal::workaround_msvc_stl_support<T>>::type

namespace internal {
template<typename T>
struct workaround_msvc_stl_support : public T
{
	inline workaround_msvc_stl_support()
		: T()
	{
	}
	inline workaround_msvc_stl_support(const T& other)
		: T(other)
	{
	}
	inline operator T&() { return *static_cast<T*>(this); }
	inline operator const T&() const { return *static_cast<const T*>(this); }
	template<typename OtherT>
	inline T& operator=(const OtherT& other)
	{
		T::operator=(other);
		return *this;
	}
	inline workaround_msvc_stl_support& operator=(const workaround_msvc_stl_support& other)
	{
		T::operator=(other);
		return *this;
	}
};
}

#else

#define EIGEN_WORKAROUND_MSVC_STL_SUPPORT(T) T

#endif

}

#endif // EIGEN_STL_DETAILS_H
